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4.2.6 The Simplified Fold Chart
The simplified fold chart located on the exit table provides
paper stop settings for five standard cut paper sizes. Two are
metric (A3 & A4), and three are inch (8 1/2 x 11, 8 1/2 x 14, 11
x 17). The four most popular folds (letter, "Z", double half, and
half) are illustrated.
The fold chart refers to "1st", which corresponds to paper stop
settings on the first fold table, and "2nd", which corresponds to
paper stop settings on the second fold table. The letters on the
fold chart correspond to the letter position on the fold indicator
rulers. The paper stop pointers should be set so they bisect the
circle of the appropriate letter setting.
NOTE: To avoid confusion, the fold chart indicates all
half folds should be made on the second fold table.
However, half folds can be made on either fold table,
depending on the weight of the paper being folded.
Generally, lighter weight stocks should be folded with
the first/upper fold table and heavier stocks with the
second/lower fold table. (See Section 4.2.3.)
Any paper size not shown on the fold chart up to 14" x 18" can
be set on the fold tables by following this procedure. Hand-fold
the sheet into the required fold. Measure the distance between
each fold. Set the paper stops on the first and second fold tables
according to measurements.
4.2.7 The Speed Control
The speed control is an SCR type control that converts alternat-
ing current (AC) to direct current (DC). The folding motor of
the folder is powered by direct current. The speed control is a
combination on/off switch and variable speed regulator. The
control is mounted on the upper left corner of the right (opera-
tors') side cover. To activate the feed system of the folder, turn
the speed control clockwise. To incrementally increase the feed
speed, continue to turn the speed control clockwise. To decrease
the feed speed, turn the speed control counterclockwise. To
deactivate the feed system, turn the speed control counterclock-
wise until it stops.
4.2.8 The Vacuum And Air Controls
See Figure 9.
Extending from the
upper left of the
front panel are
three control valves
and a vacuum
gauge. The left
valve controls the
air flow to the right
feed table paper
guide. The valve
has two settings;
on, and off. Turn
the valve off when refolding previously folded
stock. (See Section 4.3.5, setup for a french fold, and Section
4.3.6, setup for a baronial fold.) Turn the valve on for all other
applications.
The center valve controls air flow (paper lift) to the feed table
paper guides and the nose pipe. (The nose pipe is located in the
sheet detector block.)
The right valve controls the vacuum to the vacuum roller. To
the right of the valve is the vacuum gauge, which indicates how
much vacuum is used to advance sheets into the machine.
NOTE: Excessive vacuum can leave marks on the
paper.
4.3 Fold Setup
4.3.1 Setup For A Letter Fold (8 1/2" x 11"
or A4)
Set the feed table as described in Section 4.2.2. Set the sheet
detector as described in Section 4.2.1. Set the paper stop on the
first/upper fold table to the center of the letter A (G for A4) on
the scales. Set the paper stop on the second/lower fold table to
the center of the letter S (M for A4) on the scales. Move the
paper stops as described in Section 4.2.3. Jog the paper to be
processed on an Martin Yale Model 400 or Model 4200 Jogger,
or hand-jog.
Remove the first/upper fold table. Turn on the pump motor
switch and manually feed one sheet of paper into the folding
rollers. Turn off the pump motor switch. Manually feed the
sheet through the folding rollers until the sheet edge is in front
of the upper and lower accessory shafts. Set the two upper and
two lower guide rollers on the accessory shafts so they are
equally spaced from the left and right sheet edge. Lock the
guide rollers on the flat part of the shafts.
Manually feed the sheet past the guide rollers until the sheet
falls onto the conveyor table. Set the stacking wheel assembly
so the distance from the edge of the folded sheet to the center of
the stacking wheel is about 1". The center of the stacking
wheels is the point where the wheels contact the conveyor belt.
Reinstall the first/upper fold table.
CAUTION: Complete the operational setup sections
before activating the folder.
Turn on the speed control and choose a folding speed setting.
Activate the pump motor switch. Fold several sheets and stop
the machine. Inspect the folded pieces for fold accuracy and
consistency.
Fig. 9
NOTE: The letter settings on the fold table scales are
approximate only. Fine fold adjustments must be
7
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